.container {
	width: 1000px;
	margin: 0 auto;
	padding: 50px;
	text-align: center;
	position: relative;
	background-color: rgb(218, 218, 218);
}

.clearfix:after {
	content: '';
	display: block;
	clear: both;
}


/* 立方体------- */
.cube {
	width: 200px;
	height: 200px;
	/* background: gainsboro; */
	transform-style: preserve-3d;
	transform: rotateX(30deg) rotateY(30deg);
	position: relative;
	margin: 200px auto;

}

.face {
	width: 200px;
	height: 200px;
	position: absolute;
	opacity: 0.6;
	font-size: 2em;
	color: white;
	text-transform: uppercase;
	line-height: 200px;
	/* backface-visibility: hidden; */
	transition: all 1s linear;
}

.front {
	background-color: red;
	transform: translateZ(100px);
}

.back {
	background-color: green;
	transform: rotateY(180deg) translateZ(100px);
}

.left {
	background-color: blue;
	transform: rotateY(90deg) translateZ(100px);
}

.right {
	background-color: orange;
	transform: rotateY(-90deg) translateZ(100px);
}

.top {
	background-color: purple;
	transform: rotateX(90deg) translateZ(100px);
}

.bottom {
	background-color: black;
	transform: rotateX(-90deg) translateZ(100px);
}

.btn {
	border-radius: 50% 50%;
	width: 80px;
	height: 80px;
	background: #000000;
	color: white;
	border: none;
}
